Split Global ITs per command
Use Spock @Unroll annotation and dynamic methods names for a better reporting in case of error in data driven tests
Use the spock @Subject annotation to define the main class tested by the specification
AM-100 : Unify error messages displayed when an add-on isn't found (describe or install commands)
AM-102 : If --offline is used, --no-cache parameter isn't used
Remove useless comment
Update list integration tests (docs, errors messages checks ..)
AM_UNINST_02 : Add missing warning message